Re: crazy idea!
the key is to have an inner liner that sits seperate from the outer body. so that it has an air gap. then you could have a load of top latches that hold the tins and also allow you to fill with ice. ensure that the hole for the latch has a tube going down into the inner liner so that the air gap doesn't have any leaks into it whilst it holds the ice. at the bottom end have a little tap to drain the melted ice.
the latch lids will hold down the tins into the ice. so only open for tini then close once tini has been replaced or if left empty. to keep cool.
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